US Bridges

Mo 109 S over Clifty CR

Fair

St. Louis County, Missouri · S 31 T 44 N R 4 E · Structure no. 3502

Built
1988
37 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
40 ft
3 main spans
Daily traffic
22,783
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 109 S over Clifty CR is a concrete continuous culvert carrying Mo 109 S over Clifty CR in St. Louis County, Missouri. It was built in 1988, so it is 37 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 22,783 vehicles a day, roughly 3% of them trucks, projected to reach 31,896 by 2044. The structure is 40 ft (12.1 m) long. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesMo 109 S
CrossesClifty CR
LocationS 31 T 44 N R 4 E
RouteState Highway 109
CountySt. Louis County
StateMissouri
Coordinates38.51262, -90.62384
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.2 US tons
Inventory rating57.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length40 ft (12.1 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,783 (2024)
Projected traffic31,896 by 2044
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 109 S over Clifty CR built?

It was built in 1988, making it 37 years old in 2025.

What condition is Mo 109 S over Clifty CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does Mo 109 S over Clifty CR carry?

About 22,783 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Mo 109 S over Clifty CR?

The structure is 40 ft (12.1 m) long with a longest span of 12 ft (3.7 m).

Who owns Mo 109 S over Clifty CR?

It is owned by the State Highway Agency.